Animation in UWP

I am trying to make a TextBlockFade In and Fade Out in a UWP automatically. I tried searching for the same but didn't found any samples or a proper documentation for the same. Is is possible to add animation, if yes please help me with a sample.

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I'm working on a UWP Twitter app, and I'm making use of the VisualStateManager to change the layout based on the width of the app window (mostly for tablet and mobile support).

I've read up on this a bit, and it sounds like HorizontalAlignment="Stretch" is what I need to resize a GridView to the width of the ListViewItem parent that contains it.

However, this isn't happening. Looking in the live XAML view while debugging, my ListView and ListViewItem is taking up the full width of the app window, but the GridView is not. It's sizing based on the content it contains.

Edit
So I just found the HorizontalContentAlignment attribute of ListViewItem, but since my ListViewItems are being created dynamically when I set the ItemsSource of my ListView, I'm not sure how to set this property.

I'm writing an app that needs to make some HTTPs requests that use a client certificate. However, I can't find any documents on how to install the certificate and then load it for use. I know that you can use the certificate by making a HttpBaseProtocolFilter and adding a certificate but how do you load the certificate for use here? And if you have a .pfx file with your client certificate, how do you install it with your package?

I'm not an expert in using Windows composition APIs. How to implement a DropShadow on either a control or a layout or any visual control in UWP without using a DropShadowPanel for some purposes. An attached example would be awesome. Also please make sure that the shadow effect is behind the control and doesn't overlay it